CVE•Published 2026-07-14•Modified 2026-07-28•0 articles on news•4 live references•NVD data

CVE-2026-49477Facelessuser · Soup_sieve

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 65% of all CVEs

Weaknesses (CWE)

CWE-400Uncontrolled Resource Consumption CWE-1333Inefficient Regular Expression Complexity

Description

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.

Timeline

Published 2026-07-14

Modified 2026-07-28

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-49477

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Facelessuser Soup Sieve"

All exposed Facelessuser Soup Sieve instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Soup Sieve"

HTTP body or banner mentions "Soup Sieve" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-49477